地层压力预测在M油田中的应用

The Application of Formation Pressure Prediction to M Oilfield

根据有效应力原理,运用Eaton方法和Bowers方法对研究区地层进行了地层压力预测。正常压实趋势线应提取没有扩径井眼稳定的纯泥岩段,并对不同年代地层、不同岩性段分段选取。速度是决定预测是否可靠的关键,地震速度、测井速度二者不匹配,应对所用地球物理资料进行严格完全的环境校正,并利用实测压力资料进行标定。两种方法的结果与MDT资料比对后满足精度要求,对指导研究区后续钻井施工作业及区域应力场分析等相关研究有现实意义。

According to effective stress principle, Eaton and Bowers methods are used to predict the formation pressure. The study indicated that the normal compaction trend should be extract from the shale formation which does not collapsed. Velocity is the key factor of prediction. Seismic velocity and logging velocity are not matched well, so logging data need to be corrected by caliper log and calibrated by test data of modular dynamic test （MDT）. The computation result from Eaton and Bowers methods are close to the test data of MDT. This will benefit the following drilling and casing work and is helpful for the anal- ysis of the stress field.